The following diagram is a sectional view of one side, of the bottom portion, of a similar stove. One difference is  where the air supply enters the outside can. The drawing was meant to depict the true size of the stove. I have inserted the "9 inches" measurement on the side, as a reference. It printed out full size for me.


To use this stove, you fill the combustion chamber with dry twigs and light it by dropping some burning paper down the chimney on top of the twigs. The wood will pyrolyse from the top down and then the char portion will burn from the bottom up. The graph below show the point at which it becomes a charcoal fire as labeled "flame out".

Below are a couple of detail drawings to assist the builder.